4. Yellowstone National Park

Established in 1872, Yellowstone is the nation's oldest national park. It's known for its geysers and hot springs. Indeed, Yellowstone contains 60% of the world's geysers, including Old Faithful, its most famous, and the Grand Prismatic Hot Spring, America's largest hot spring. The park also houses a rich collection of historical artifacts in its museum, library and research centers.

Established in 1872, Yellowstone is the nation's oldest national park. It's known for its geysers and hot springs. Indeed, Yellowstone contains 60% of the world's geysers, including Old Faithful, its most famous, and the Grand Prismatic Hot Spring, America's largest hot spring. The park also houses a rich collection of historical artifacts in its museum, library and research centers.

Established in 1872, Yellowstone is the nation's oldest national park. It's known for its geysers and hot springs. Indeed, Yellowstone contains 60% of the world's geysers, including Old Faithful, its most famous, and the Grand Prismatic Hot Spring, America's largest hot spring. The park also houses a rich collection of historical artifacts in its museum, library and research centers.